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Male Hiram Gilbert Click to view Hiram Gilbert in the family tree

1   Hiram's father was Hiram Gilbert and his mother was Sarah Hibbard.  His paternal grandparents were John Gilbert and Theodosia Marsh. He had three brothers and four sisters, named Frederick, Giles, Newington, Caroline, Cornelia, Nancy and Pamela.1 

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw